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https://issues.apache.org/jira/browse/HDFS-14740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feilong He updated HDFS-14740:
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Description: In HDFS-13762, persistent memory is enabled in HDFS
centralized cache management. Even though persistent memory can persist cache
data, for simplifying the implementation, the previous cache data will be
cleaned up during DataNode restarts. We propose to improve HDFS persistent
memory (PM) cache by taking advantage of PM's data persistence characteristic,
i.e., recovering the cache status when DataNode restarts, thus, cache warm up
time can be saved for user. (was: In HDFS-13762, persistent memory is enabled
in HDFS centralized cache management. Even though persistent memory can persist
cache data, for simplifying the implementation, the cache data will be cleaned
up after DataNode restarts. We propose to improve HDFS persistent memory (PM)
cache by taking advantage of PM's data persistence characteristic, i.e.,
recovering the cache status when DataNode restarts, thus, cache warm up time
can be saved for user.)
> HDFS read cache persistence support
> -----------------------------------
>
> Key: HDFS-14740
> URL: https://issues.apache.org/jira/browse/HDFS-14740
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Feilong He
> Priority: Major
>
> In HDFS-13762, persistent memory is enabled in HDFS centralized cache
> management. Even though persistent memory can persist cache data, for
> simplifying the implementation, the previous cache data will be cleaned up
> during DataNode restarts. We propose to improve HDFS persistent memory (PM)
> cache by taking advantage of PM's data persistence characteristic, i.e.,
> recovering the cache status when DataNode restarts, thus, cache warm up time
> can be saved for user.
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